2011 Ford F150 Regular Cab Owner Guide 3rd Printing - Page 294

Driving • Some noise is normal during operation. If excessive, check for low power steering pump fluid level before seeking service by your authorized dealer. • Heavy or uneven steering efforts may be caused by low power steering pump fluid level. Check for low power steering pump fluid level before seeking service by your authorized dealer. • Do not fill the power steering pump reservoir above the MAX mark on the reservoir, as this may result in leaks from the reservoir. All engines If the steering wanders or pulls equipped with either an EPS or a hydraulic steering system, check for: • an improperly inflated tire • uneven tire wear • loose or worn suspension components • loose or worn steering components • improper steering alignment A high crown in the road or high crosswinds may also make the steering seem to wander/pull. LIMITED-SLIP AXLE (IF EQUIPPED) This axle provides added traction on slippery surfaces, particularly when one wheel is on a poor traction surface. Under normal conditions, the limited-slip axle functions like a standard rear axle. The axle may exhibit a slight noise or vibration in tight turns with low vehicle speed. This is normal behavior and indicates the axle is working. Electronic locking differential (ELD) (if equipped) The electronic locking differential provides added traction on slippery and/or off-road surfaces, particularly when one wheel is on a poor traction surface. In normal driving conditions, the rear axle functions as a standard axle. The ELD may be locked or unlocked by the vehicle operator. Refer to Four-wheel drive (4WD) operation section in this chapter for further details on ELD function and usage. When the axle is unlocked, it will function like a standard rear axle. When the axle is locked, it will not allow the rear wheels to rotate at different speeds when turning. The ELD axle is not recommended for use on good traction surfaces such as dry pavement. Doing so may result in abnormal driving behavior while cornering and excessive tire wear. 294 2011 F-150 (f12) Owners Guide, 3rd Printing USA (fus)